BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A backlight unit (150) and a liquid crystal display device. The liquid crystal display device comprises a shell component (110) with a display window, a liquid crystal panel (130) arranged in the shell component (110) and the backlight unit (150) for providing a light source (1572) for the liquid crystal panel (130). The backlight unit (150) comprises a light emergent top surface (1511) directly facing the liquid crystal panel (130), a light guide plate (151) adjacently connected to an incident side surface (1513) of the light emergent top surface (1511), an optical membrane (153), a reflecting plate (155) arranged on a bottom surface of the light guide plate (151) back on to the light emergent top surface (1511), and a light source component (157) arranged on one side of the incident side surface (1513). The light source component (157) comprises a substrate (1571), a plurality of light sources (1572) and a radiating plate (1573) which is closely attached to the substrate (1571) and the shell component (110). One side of the substrate (1571) or the radiating plate (1573) close to the light emergent top surface (1511) is bent to form a first bending portion (1574); a surface of the first bending portion (1574) on the side close to the light source (1572) is provided with a first reflecting surface (1575). The light emitted by the light source (1572) is reflected by using the first reflecting surface (1575), so that most of the light emitted by the light source (1572) enters the light guide plate (151), which thereby greatly improves the utilization rate of light of the light source (1572), and the penetration rate.